> For the complete documentation index, see [llms.txt](https://docs.acestudio.ai/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.acestudio.ai/docs/product-wiki-zh/ai-yue-qi/create-instrument-sounds/expression-controls.md).
# 表情参数
## 什么是表情参数
表情参数是一组可随时间自动化的参数，可为演唱增添细腻变化与真实感，让你能够像“绘制”一样指定效果应当生效的位置。
### 可用控制项
颤音
颤音是音符音高的细微而快速的波动，可为声音增添温暖、表现力与层次感。
分割音色
分割音色是一种高级技巧，通过同时产生多个音高来创造粗粝、富有质感的声音。它非常适合为你的旋律增添原始、锋利的特质，或营造张力感。
## 编辑表情参数
1. 选择钢琴卷帘窗下方的表情参数。
2. 单击并拖动，即可“绘制”要激活的区域。
3. 只需在已激活区域上右键拖动，即可将其擦除。
---
# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.
## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.
Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter:
```
GET https://docs.acestudio.ai/docs/product-wiki-zh/ai-yue-qi/create-instrument-sounds/expression-controls.md?ask=&goal=
```
`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.
Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.